Kinda depends on how you ride, roadie in kit, commuter in street clothes, mtbr in baggies...and the size/weight of the weapon,and the specific laws regarding concealment where you are riding. In most areas, the concealed weapon may never inadvertently (or advertently) show or be evident, as in having its shape visible through fabric for example . A small fanny pack can work across these modalities. Obviously, if you stop to and leave the bike for any reason, the weapon needs to go with you.